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| Hoffert, Michel; Karpoff, Anne-marie; Clauer, Norbert; Schaaf, André; Courtois, Chantal; Pautot, Guy. |
| A sedimentological, biostratigraphical, mineralogical, geochemical (major and trace elements including rare earths) and isotopic (Rb/Sr) study was made of core samples drilled between the Touamotou Archipelago and the Marquises Islands. This structurally complex region of the South Pacific is characterised by volcanism and deep ocean water circulation. The samples consisted of two 20 cm cores of surface sediment, and a flattened nodule with indurated centre, taken close to the cores. One core sample (T KR 07) is entirely composed of brown, soft sediment. The top part of the second core (T KS 19) is also brown mud but the bottom is indurated. The brown sediment is essentially composed of phillipsite, palagonite. micronodules and nontronite. The indurated... |
| Tipo: Text |
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| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5231.pdf |
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| Melguen, Marthe; Debrabant, Pierre; Chamley, Hervé; Maillot, Henry; Hoffert, Michel; Courtois, Chantal. |
| The sediments of six cores from the Rio Grande Rise side of the Vema Channel reflect major phases in the sedimentary history of this area since Ihe lower Miocene. Cores taken from below the present-day lysocline (approx. 4 000 m) consist essentially of calcareous oozes. The variable degree of preservation of the Foraminifera and Coccoliths in these cores indicates dissolution cycles apparently linked to Antarctic Bottom Water (A.A.B.W.) fluctuations. Cores taken below 4 000 m represent an incomplete and shortened sedimentary sequence parliculary characterized by the presence of red Clay and manganese nodules. The latter have a todorokite core and are associated with relatively indurated phillipsite-rich sediments. In one of the deeper cores an increase,... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5228.pdf |
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